rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6621/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=14985, q=453 ncpus=2)
task:syz.4.179 state:R running task stack:25096 pid:6621 tgid:6621 ppid:5848 task_flags:0x40004c flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5397 [inline]
__schedule+0x16fd/0x4cf0 kernel/sched/core.c:6786
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7109
irqentry_exit+0x6f/0x90 kernel/entry/common.c:307
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:page_ext_invalid mm/page_ext.c:245 [inline]
RIP: 0010:lookup_page_ext mm/page_ext.c:261 [inline]
RIP: 0010:page_ext_get+0x1cb/0x2f0 mm/page_ext.c:539
Code: 89 ff e8 b8 ef f4 ff 4d 8b 3f e8 60 b4 78 ff 89 c5 31 ff 89 c6 e8 e5 e1 92 ff 85 ed 0f 84 f4 00 00 00 e8 98 dd 92 ff 4d 85 ff <40> 0f 95 c5 4c 89 fe 48 83 e6 01 41 0f 94 c4 31 ff e8 5f e2 92 ff
RSP: 0018:ffffc9001e21f0b0 EFLAGS: 00000286
RAX: ffffffff822d4938 RBX: ffffffff822d4792 RCX: ffff88802e1b9e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff822d4792
R10: dffffc0000000000 R11: fffff94000358a9f R12: 00000000000001a0
R13: dffffc0000000000 R14: 000000000006b153 R15: ffff88801bb80000
__reset_page_owner+0x28/0x1f0 mm/page_owner.c:294
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1248 [inline]
free_unref_folios+0xc66/0x14d0 mm/page_alloc.c:2763
folios_put_refs+0x559/0x640 mm/swap.c:992
free_pages_and_swap_cache+0x4be/0x520 mm/swap_state.c:267
__tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline]
tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:397 [inline]
tlb_flush_mmu+0x3a0/0x680 mm/mmu_gather.c:404
zap_pte_range mm/memory.c:1774 [inline]
zap_pmd_range mm/memory.c:1827 [inline]
zap_pud_range mm/memory.c:1856 [inline]
zap_p4d_range mm/memory.c:1877 [inline]
unmap_page_range+0x38fd/0x41c0 mm/memory.c:1898
unmap_single_vma mm/memory.c:1941 [inline]
unmap_vmas+0x399/0x580 mm/memory.c:1985
exit_mmap+0x248/0xb50 mm/mmap.c:1284
__mmput+0x118/0x420 kernel/fork.c:1121
exit_mm+0x1da/0x2c0 kernel/exit.c:581
do_exit+0x648/0x22e0 kernel/exit.c:952
do_group_exit+0x21c/0x2d0 kernel/exit.c:1105
__do_sys_exit_group kernel/exit.c:1116 [inline]
__se_sys_exit_group kernel/exit.c:1114 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1114
x64_sys_call+0x21ba/0x21c0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcd82d8e9a9
RSP: 002b:00007ffcf9e329c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fcd82d8e9a9
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffcf9e32a2c R08: 00000013f9e32abf R09: 00000000000927c0
R10: 00000000000125e0 R11: 0000000000000246 R12: 000000000000001c
R13: 00000000000927c0 R14: 0000000000028a96 R15: 00007ffcf9e32a80
rcu: rcu_preempt kthread timer wakeup didn't happen for 10509 jiffies! g14985 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=10108
rcu: rcu_preempt kthread starved for 10510 jiffies! g14985 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:I stack:27128 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5397 [inline]
__schedule+0x16fd/0x4cf0 kernel/sched/core.c:6786
__schedule_loop kernel/sched/core.c:6864 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6879
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2054
rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2256
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 5857 Comm: syz-executor Not tainted 6.16.0-rc7-syzkaller-00034-g25fae0b93d1d #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:lock_acquire+0x175/0x360 kernel/locking/lockdep.c:5875
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 6b 94 01 11 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc900000068b8 EFLAGS: 00000206
RAX: a1d44ded6bb98300 RBX: 0000000000000000 RCX: a1d44ded6bb98300
RDX: 0000000000000000 RSI: ffffffff8db84602 RDI: ffffffff8be28d40
RBP: ffffffff8172aae5 R08: 0000000000000000 R09: ffffffff8172aae5
R10: dffffc0000000000 R11: ffffffff81acfe40 R12: 0000000000000002
R13: ffffffff8e13f0e0 R14: 0000000000000000 R15: 0000000000000246
FS: 000055558dd65500(0000) GS:ffff888125c23000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f396a369ff4 CR3: 0000000059355000 CR4: 0000000000350ef0
Call Trace:
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:841 [inline]
class_rcu_constructor include/linux/rcupdate.h:1155 [inline]
unwind_next_frame+0xc2/0x2390 arch/x86/kernel/unwind_orc.c:479
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
unpoison_slab_object mm/kasan/common.c:319 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:345
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4148 [inline]
slab_alloc_node mm/slub.c:4197 [inline]
kmem_cache_alloc_node_noprof+0x1bb/0x3c0 mm/slub.c:4249
__alloc_skb+0x112/0x2d0 net/core/skbuff.c:660
alloc_skb include/linux/skbuff.h:1336 [inline]
ip_frag_next+0xd1/0xa60 net/ipv4/ip_output.c:687
ip_do_fragment+0x76d/0x1770 net/ipv4/ip_output.c:897
iptunnel_xmit+0x571/0xa00 net/ipv4/ip_tunnel_core.c:82
udp_tunnel_xmit_skb+0x266/0x3c0 net/ipv4/udp_tunnel_core.c:188
geneve_xmit_skb drivers/net/geneve.c:921 [inline]
geneve_xmit+0x2079/0x2b70 drivers/net/geneve.c:1046
__netdev_start_xmit include/linux/netdevice.h:5215 [inline]
netdev_start_xmit include/linux/netdevice.h:5224 [inline]
xmit_one net/core/dev.c:3830 [inline]
dev_hard_start_xmit+0x2d7/0x830 net/core/dev.c:3846
__dev_queue_xmit+0x1adf/0x3a70 net/core/dev.c:4713
dev_queue_xmit include/linux/netdevice.h:3355 [inline]
neigh_hh_output include/net/neighbour.h:523 [inline]
neigh_output include/net/neighbour.h:537 [inline]
ip6_finish_output2+0x11bc/0x16a0 net/ipv6/ip6_output.c:141
NF_HOOK include/linux/netfilter.h:317 [inline]
ndisc_send_skb+0xb47/0x1400 net/ipv6/ndisc.c:513
addrconf_rs_timer+0x369/0x670 net/ipv6/addrconf.c:4036
call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1798 [inline]
__run_timers kernel/time/timer.c:2372 [inline]
__run_timer_base+0x61a/0x860 kernel/time/timer.c:2384
run_timer_base kernel/time/timer.c:2393 [inline]
run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
handle_softirqs+0x286/0x870 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:7109
Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 08 00 00 00 74 64 bf 01 00 00 00 e8 9b 1d 22 f6 e8 b6 ee 58 f6 fb bf 01 00 00 00 2b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc9000389f9e0 EFLAGS: 00000282
RAX: a1d44ded6bb98300 RBX: 0000000000000000 RCX: a1d44ded6bb98300
RDX: 0000000000000000 RSI: ffffffff8d9969a8 RDI: 0000000000000001
RBP: ffffc9000389fa80 R08: ffffffff8fa1dcf7 R09: 1ffffffff1f43b9e
R10: dffffc0000000000 R11: fffffbfff1f43b9f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000713f3c
irqentry_exit+0x6f/0x90 kernel/entry/common.c:307
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:hrtimer_start_range_ns+0x38/0x1080 kernel/time/hrtimer.c:1323
Code: 48 81 ec 80 00 00 00 41 89 ce 48 89 54 24 48 48 89 74 24 20 49 89 fd 49 bc 00 00 00 00 00 fc ff df e8 9c e4 11 00 49 8d 5d 3a <48> 89 d8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 05 0e 00 00 0f b6
RSP: 0018:ffffc9000389fb48 EFLAGS: 00000293
RAX: ffffffff81ae4234 RBX: ffffc9000389fd7a RCX: ffff8880768e9e00
RDX: 0000000000000000 RSI: 0000000000989680 RDI: ffffc9000389fd40
RBP: ffffc9000389fcf0 R08: ffff8880768e9e1b R09: 1ffff1100ed1d3c3
R10: dffffc0000000000 R11: ffffed100ed1d3c4 R12: dffffc0000000000
R13: ffffc9000389fd40 R14: 0000000000000001 R15: ffffc9000389fd40
hrtimer_start_expires include/linux/hrtimer.h:277 [inline]
hrtimer_sleeper_start_expires kernel/time/hrtimer.c:2023 [inline]
do_nanosleep+0x191/0x600 kernel/time/hrtimer.c:2097
hrtimer_nanosleep+0x169/0x360 kernel/time/hrtimer.c:2147
__do_sys_clock_nanosleep kernel/time/posix-timers.c:1399 [inline]
__se_sys_clock_nanosleep+0x2f1/0x380 kernel/time/posix-timers.c:1376
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe1383c1265
Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 f6 54 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 4f 55 ff ff 48 8b 04 24 48 83 c4 28 f7 d8
RSP: 002b:00007ffe6f5d8790 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 0000000000000077 RCX: 00007fe1383c1265
RDX: 00007ffe6f5d87d0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffe6f5d883c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000001388
R13: 00000000000927c0 R14: 000000000002912b R15: 00007ffe6f5d8890